Thomas Hobbes, Alan Cromartie, Quentin Skinner (2005). “Thomas Hobbes: Writings on Common Law and Hereditary Right: A Dialogue Between a Philosopher and a Student, of the Common Laws of England. Questions Relative to Hereditary Right”, p.10, Oxford University Press

Thomas Hobbes (1750). “The Moral and Political Works of Thomas Hobbes of Malmesbury: Never Before Collected Together : To which is Prefixed, the Author's Life, Extracted from that Said to be Written by Himself, ...”, p.133